[FFmpeg-devel] [PATCH 7/7] avradio/sdr: workaround inverted gain parameter on sdrplay

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavradio/sdr.h        | 1 +
 libavradio/sdrdemux.c   | 1 +
 libavradio/sdrinradio.c | 7 +++++++
 3 files changed, 9 insertions(+)

diff --git a/libavradio/sdr.h b/libavradio/sdr.h
index 395b056531..27ec1db4f3 100644
--- a/libavradio/sdr.h
+++ b/libavradio/sdr.h
@@ -257,6 +257,7 @@ typedef struct SDRContext {
     int missing_streams;
 
     int rtlsdr_fixes;
+    int sdrplay_fixes;
 } SDRContext;
 
 typedef struct ModulationDescriptor {
diff --git a/libavradio/sdrdemux.c b/libavradio/sdrdemux.c
index 5214aea7be..1b3061a406 100644
--- a/libavradio/sdrdemux.c
+++ b/libavradio/sdrdemux.c
@@ -2180,6 +2180,7 @@ const AVOption ff_sdr_options[] = {
 
     { "driver"  , "sdr driver name"  , OFFSET(driver_name), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
     { "rtlsdr_fixes" , "workaround rtlsdr issues", OFFSET(rtlsdr_fixes), AV_OPT_TYPE_INT , {.i64 = -1}, -1, 1, DEC},
+    { "sdrplay_fixes" , "workaround sdrplay issues", OFFSET(sdrplay_fixes), AV_OPT_TYPE_INT , {.i64 = -1}, -1, 1, DEC},
     { "sdr_sr"  , "sdr sample rate"  , OFFSET(sdr_sample_rate ), AV_OPT_TYPE_INT , {.i64 = 0}, 0, INT_MAX, DEC},
     { "sdr_freq", "sdr frequency"    , OFFSET(wanted_freq), AV_OPT_TYPE_INT64 , {.i64 = 9000000}, 0, INT64_MAX, DEC},
     { "gain" , "sdr overall gain",  OFFSET(sdr_gain),  AV_OPT_TYPE_INT , {.i64 =  GAIN_SDR_AGC}, -3, INT_MAX, DEC, "gain"},
diff --git a/libavradio/sdrinradio.c b/libavradio/sdrinradio.c
index 63a9cade78..f824a1d190 100644
--- a/libavradio/sdrinradio.c
+++ b/libavradio/sdrinradio.c
@@ -76,6 +76,11 @@ static int sdrindev_set_gain_callback(SDRContext *sdr, float gain)
     if (sdr->sdr_gain == GAIN_DEFAULT)
         return 0;
 
+    //sdrplay has a inverted gain range, not using max_gain as this is a user parameter
+    if (sdr->sdrplay_fixes > 0) {
+        gain = FFMIN(48 - gain, 45);
+    }
+
     if (soapy) {
         int ret = SoapySDRDevice_setGainMode(soapy, SOAPY_SDR_RX, 0, sdr->sdr_gain == GAIN_SDR_AGC);
         if (ret) {
@@ -192,6 +197,8 @@ static int sdrindev_initial_hw_setup(AVFormatContext *s)
 
     if (sdr->rtlsdr_fixes < 0)
         sdr->rtlsdr_fixes = !strcmp(sdr->driver_name, "rtlsdr");
+    if (sdr->sdrplay_fixes < 0)
+        sdr->sdrplay_fixes = !strcmp(sdr->driver_name, "sdrplay");
 
     SoapySDRKwargs_set(&args, "driver", sdr->driver_name);
     sdr->soapy = soapy = SoapySDRDevice_make(&args);
-- 
2.31.1